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Issue 3, 2009
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Extraction of lignin from lignocellulose at atmospheric pressure using alkylbenzenesulfonate ionic liquid†

Suzie S. Y. Tan,*ac   Douglas R. MacFarlane,a   Jonathan Upfal,b   Leslie A. Edye,c   William O. S. Doherty,c   Antonio F. Patti,ad   Jennifer M. Pringlea  and  Janet L. Scotta  
Author affiliations

* Corresponding authors

a School of Chemistry and Centre for Green Chemistry, Monash University, Wellington Rd, Clayton, VIC, Australia
E-mail: suzie.tan@sci.monash.edu.au
Fax: +613 9905 4597
Tel: +613 9905 4599

b Viridian Chemicals Pty Ltd, 1.2/193 Domain Rd, South Yarra, VIC, Australia

c Sugar Research and Innovation, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, Australia

d School of Applied Sciences and Engineering, Monash University, Churchill, VIC, Australia

Abstract

Lignocellulosic materials are a potentially valuable source of both aromatic compoundsvia the lignin component and sugars from the cellulose and hemicellulose components. However, efficient means of separating and depolymerising the components are required. An ionic liquid mixture containing the 1-ethyl-3-methylimidazolium cation and a mixture of alkylbenzenesulfonates with xylenesulfonate as the main anion was used to extract lignin from sugarcane plant waste at atmospheric pressure and elevated temperatures (170–190 °C). The lignin was recovered from the ionic liquid by precipitation, allowing the ionic liquid to be recycled. An extraction yield exceeding 93% was attained. The lignin produced had a molecular weight of 2220 g/mol after acetylation. The regenerated ionic liquid showed good retention of structure and properties. The other product of the extraction was a cellulose pulp, which can be used in further processing.

Graphical abstract: Extraction of lignin from lignocellulose at atmospheric pressure using alkylbenzenesulfonate ionic liquid

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Article information

https://doi.org/10.1039/B815310H
Submitted
04 Sep 2008
Accepted
18 Dec 2008
First published
06 Feb 2009
Green Chem., 2009,11, 339-345
Article type
Paper
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Extraction of lignin from lignocellulose at atmospheric pressure using alkylbenzenesulfonate ionic liquid

S. S. Y. Tan, D. R. MacFarlane, J. Upfal, L. A. Edye, W. O. S. Doherty, A. F. Patti, J. M. Pringle and J. L. Scott, Green Chem., 2009, 11, 339
DOI: 10.1039/B815310H

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